Country Squire Old Toby in my MM Mark Twain with its new Forever Stem ! I ordered the "G" stem (4 5/8ths) in Amber Tortoise which makes it like a semi-churchwarden or churchwarden. It doesn't clench comfortably when loaded with tobacco but is excellent as a sipper when held like a cigar by the shank.
Interestingly, the longer stem tones down the sweetness of the Old Toby a bit and it tastes like its tin/bag note. Really excellent. Also the smoke is cool and dry.